Countersinking machine



March 13, 1934. H, M JOHNSTON 1,951,093

COUNTERS INKING MACHINE Filed April 9, 1932 `2 Sheets-Sheet 1 March 13,1934. v H, M, JQHNSTON 1,951,093

k coUNTERsINK'ING MACHINE Filed April 9, 1952 2 Sheets-Sheet 2 [men/for;

HQE/9v /V JOHNSTo/V,

Patented Mar. 13, 1934 UNITED STATES COUNTERSINKING MACHINE Harry M.Johnston, McKeesport, Pa., assignor to National Tube Company, acorporation of New Jersey Application April 9, 1932, serial No. 604,305

1 Claim.

This invention is a machine particularly in-I,

engage the ends of the levers 7 so as to reciprotended to countersinkthe ends of couplings, al-f cate the spindles 3 together during theperiod though it may be used for other purposes, one of the objectsbeing to construct it to receive a number of units of work andautomatically drill or countersink both ends of each in rapidsuccession. Other objects may be understood from the following.

Having reference to the accompanying drawings which illustrate aspecific form of the invention:

Figure 1 is an enlarged detailed front elevation.

Figure 2 is a cross-section from the line II-II in Figure 1.

Figure 3 is a fragmentary top plan looking down from the line III- IIIin Figure 2.

This machine consists of a base or frame 1 which at each end mountselectric motors 2 driving alined opposed spindles 3. These spindles areon shafts 4 which are reciprocably mounted in housings 5, thisnecessitating splined connections 6 somewhere between thes shafts andthe fixed parts connecting them to the motor 2. Pivoted levers 7 areconnected to the spindles 3 so that when their ends are moved thespindles will likewise be moved. These levers have rollers on theirends.

rVise jaws 9 and 10 are between the reciprocable spindles 3 and aretractable stop 11 is directly beneath these.V A guideway 12 isarranged to feed couplings 13 vertically downward between the vise jawsand by the stop 1l. Both the vise jaws 10 and the stop 11 are urged tocoupling engaging position by plungers 14 which fit a chamber 15 inwhich a constant air pressure is maintained. Cross-heads 16, extend fromeither side of the outer ends of the plungers 14 and push-rods 17 extendbackwardly from both ends of these to other cross-heads 18. These othercross-heads are engaged by pivoted rocker-arms 19 and 20 so that whenthe ends of these rocker-arms are pushed forwardly the push-rods 17 willbe drawn backwardly and the vise jaw 10 released and the stop 1lretracted.

The levers 7 and the rocker-arms 19 and 20 are operated by a set of cams21, 22 and 23, all mounted on a shaft 24 driven by an electric motor 25through a gear reduction unit 26.

The retractable stop 11 is arranged so that when it stops the passage ofone of the couplings 13 the next coupling above will be stopped betweenthe vice jaws 9 and 10. Therefore, by retracting the stop 1l only whenthe jaw 10 is engaging one of the couplings and by releasing the jaw 10only when the stop is forward it is possible to feed the couplings oneat a time.

To accomplish the above the cams 22 and 23 have thei'` operatingsurfaces cut to cause alternate operation of the rocker-arms 19 and 20and the cam 21 has double operating surfaces which that the jaw 10 is inholding position, these ends being constantly urged against this cam byplungers 27 arranged to enter chambers 28 in which a constant airpressure is maintained.

Assuming that the guideway 12 is lled with couplings 13, that propercountersinking tools 29 'are mounted in the spindles 3 and that al1 themotors are running', the operation of the machine is as follows.

One of the couplings is held by the vise jaws 9 and 10 while the tools29 are rapidly moved into and out of its ends by the action of the cam21. The cam 23 now forces the jaw 10 to release the coupling whose endshave just been countersunk, it dropping to the stop 11 and allowing thenext coupling to come between the two vise jaws, and then release thejaw l0 so that it is pushed against this next coupling by its plunger14. The cam 21 again causes reciprocation of the tools 29 and, whilethis reciprocation is going on, the cam 22 retracts the stop 11 so thatthe previously countersunk coupling can drop from the machine.

Preferably the guideway r12 is fed with the couplings by a trough 30and, as the couplings are not always accurately cut to the same length,this may be constructed so that its upstanding edges form a gagewhereby, should the coupling t the trough, it will be certain to t theguideway 12. This will avoid any jamming of the couplings in theguideway 12 which would necessitate the machines shutdown.

Although a specific form of this invention has been shown and describedin accordance with the patent statutes, it is not intended to limit itsscope exactly thereto, except as dened by the following.

I claim:

A machine including reciprocable spindles, xed and retractable vise jawsbetween said spindles, a vertical guideway arranged to feed units ofwork to said vise jaws, a retractable stop arranged beneath said visejaws so that when one of said units is stopped thereby the next unitwill be positioned between the vise jaws, said retractable vise jaw andsaid retractable stop being arranged for parallel movement, plungersconnected to said retractable vise jaw and stop and with their endspositioned in a chamber containing compressed air so as to bereslliently urged outwardly thereby, means for alternately forcing saidretractable vise jaw and stop from unit-engaging positions and means forreciprocating said spindles together when said vise jaw is in itsunit-engaging position.

HARRY M. JOHNSTON.

